Frequencies for first 10,000 rows of impacts variable in vehicle dataset :

    Vehicle |
       Role |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        791        7.91        7.91
          1 |      7,102       71.02       78.93
          2 |      1,763       17.63       96.56
          3 |        325        3.25       99.81
          9 |         19        0.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016